Fastening for spring structures of wire.



No. 647,498. Patented Apr. I7, I900.

J. E. JOHNSON.

FASTENING FOR SPRING STRUGTURES 0F WIRE.

(Application filed Dec. 16, 1898.)

(No Model.)

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Nrrnn STATES PATENT OFFICE.

JOHN E. JOHNSON, OF ANDERSON, INDIANA.

FASTENING FOR SPRING STRUCTURES OF WIRE.

SPECIFICATION forming part of Letters Patent No. 647,498, dated April17, 1900.

Application filed December 16, 1898. Serial No. 699,484. (No modem ToaZZ whom it may concern:

Be it known that I, JoHN E. J OHNSON, a citizen of the United States,residing in the city of Anderson, in the county of Madison and State ofIndiana, have invented a new and useful Improvement in Fastenings forSpring Structures of Wire, of which the following is a specification.

My invention relates to improvements in fastenings for spring structuresof wire; and the objects of my invention are to provide a springstructure built of coiled springs so fastened or tied together as that asubstantially-smooth surface is provided, the springs are securely heldrelative to one another and cannot become displaced in use, and yettheir elasticity is not impaired or in any way affected by thefastenings used. I attain these objects by the construction illustratedin the accompanying drawings, in which- Figure 1 is a top view of aportion of a spring mattress containing my invention, showing the methodof finishing the edges and weaving the fastening-braces thereof. Fig. 2is a side View looking in the direction of the arrow, Fig. 1, of thewhole mattress partially turned upon its hinges. Fig. 3 is a top detailview of one of the hinges.

Similarlettersrefer to similarpartsthroughout the several views.

The springs A consist of double helical coils of wire. The extremities aof the wires a are attached to the end turns of said coils, thus formingclosed coil-springs. The top and bottom of the mattress are the same in.

formation of weave and fastening of the braces. The tangential braces Bextend across the top faces of the springs A, passing over the top ofthe upper coil, immediately inside of the outer turn thereof, where saidtangential braces B have the downward offsets I). Said braces Bterminate in the hooks b, which engage the upper and outer turns of thesprings A at the boundaries 6 of the mattress, and thus provide afinished edge thereto. The extremities of the hooks Z) are turneddownward to avoid the danger of being caught in bedding placed upon themattress.

Passing diametrally across the ends of the springs A, under the topturns thereof, and over the offsets b in the tangential braces B thediametrical braces 0 passes over the upper turn of the spring A,partially encircling it, then passes under the brace B at its offset 1),and returns upon said brace B, inclosing it and securely fastening theseveral adjacent parts together. Said braces C are of sufficientstrength to act as struts or exert a spreading tendency between theedges of the mattress where said braces O attach thereto and may be ofany desired form of crosssection.

At the bottom of the mattress, where the springs A of two adjacentsections mutually approach, hinges are formed by the portions 0' ofbraces O which extend beyond the springs A and tangential braces B,interweaving with them, as above described, and then forming hooks orloops which inclose the adjacent portions of springs A belonging to theother section of the mattress. I

Parallel to the diametrical braces O are the ties D, which pass underthe upper turns of the springs A and over the offset portions b of thebraces B. Said tiesD consist of straight pieces, preferably of roundwire, bent at their extremities to form hooks d d, inclosing thetangential braces B, which are thus held tightly against the outer turnsof the coils A and create a tensional strain therein.

In case the springs A mutually approach, the ties D cannot comedetached, as they are held in place upon the braces B by thesuperimposed turns of the springs A. It is thus seen that all of thebraces employed are rectilinear, except at their extremities and exceptat the offsets b in braces B. This construction furnishes an extremelysimple method of weaving, and the braces can be easily and quicklyattached.

By removing a tie Dand withdrawing the diametrical brace 0 any springmay be removed, except such outside springs as are engaged by the hooksb, in which latter instance it is necessary in addition to disengagesaid hooks b. It will be observed that the springs A are held in theirproper positions in one direction by the tension of the upper turns ofsaid springs A. It will also be observed that the surfaces of themattress are unusually smooth, for in no part is there any projectionbeyond the end turns of the springs greater than a single diameter of abrace, and except at the extreme edges of the mattress the diametralbraces C and the ties D are below the end turns of said springs A.

So far as I am aware no previous spring structures show so greatsimplicity of construction combined with so great advantages in regardto the positive fastening of the springs, the smoothness of thesurfaces, the freedom from liability to catch in adjacent fabrics, andthe facility for removing and renewing springs as does my device hereindescribed.

What I claim as new, and desire to secure by Letters Patent, is

In a structure consisting of closed coilsprings, the combination ofrectilinear braces extending diametrically across said springs,contiguously to the under portion of the up- 2 m ss per convolutions 0rrings thereof; substantially-straight transverse tangential bracespassing over the upper coils of said springs and underneath saiddiametrical braces, said transverse braces being contiguous to the saidupper coils at the inner portion thereof, and tie-pieces lying parallelwith and adjacent to said diametrical braces and wholly under the upperconvolutions or rings of said springs, said tie-pieces having hookedextremities, being rectilinear except at their said hooked extremities,and engaging pairs of said transverse braces lying adjacent but ondifferent springs, thereby causing said transverse braces to exert atensional strain on said springs.

JOHN E. JOHNSON.

WVitnesses: TOM BEDDAE, EUGENE COLLINS.

